The collection includes following ebooks
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Riordan, Rick - Percy Jackson 1 - The Lightning Thief
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Riordan, Rick - Percy Jackson 2 - The Sea of Monsters
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Riordan, Rick - Percy Jackson 3 - The Titan's Curse
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Riordan, Rick - Percy Jackson 4 - The Battle of the Labyrinth
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Riordan, Rick - Percy Jackson 5 - The Last Olympian